I however have the Gold Edition that comes pre bundled with Mask of the Betrayer expansion
Does it install automatically with NWN2 or you have to run another executable?
Please list all executables you've got in "~/.PlayOnLinux/wineprefix/NWN2/drive_c/Program Files/Atari/Neverwinter Nights 2" (there should be at least one nwn2main.exe)